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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d002a23c9cc8d770c98ec7c9812d4f5013cb732a894f203f2e9db76e910296' 
  AND token = 'jg5+LxlwV5b5Ut1O60Yat8hyg0rJ09bKtFeff7um9m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}